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Creative proofs with pigeons and boxes
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![The pigeonhole principle](/news-and-events/news/d-math-news/2016/05/creative-proofs-with-pigeons-and-boxes/_jcr_content/pageimages/imageSmall.imageformat.contentteaser.1519182625.jpg)
A principle may be simple, but in mathematics it can be the key to the solution of challenging problems. The pigeonhole principle is a good starting point for students who want to get to know the creative side of proofs.